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[TurnerFam]

- a CONVERTER converts 120v shore power DOWN to 12v power for all of your onboard 12v lights, 12v fans, 12v furnace fan, 12v water pump, etc., so that those are no longer drawing directly from the battery bank, and at the same time CHARGES the battery(s)

This is pretty stock on most ANY small to medium size RV, whether trailer, pop up, CLass C or B or A...

- an INVERTER does just the opposite: it uses BATTERY power to make 120v power to it's outlet, where you plug items in, such as a residential fridge, or to a sub-panel within your RV, where some or all of your outlets will be powered by it, when not on shore power or the generator.
An inverter is typically part of RVs that have a residential 120v fridge, and larger motorhomes and RVs that also want to provide off-grid 120v power to some or all of the outlets in the RV, all the time, such as for the microwave, device charger outlets, cpap machine outlets, and all the outlets to your TVs and satellite receivers, etc.


Since most RVs only have the CONVERTER, you would need to be plugged into shore power, or a generator, to have 120v power to all the outlets, air conditioners, etc.
This is a little less convenient while traveling, or while parked off-grid, but it's a simple way to provide electricity when the 120v power is available otherwise. You have use of your 12v devices and items and appliances ALL the time, though.